/*
 * Copyright 2009 XueSong Guo.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package cn.webwheel.di;

import java.util.ArrayList;
import java.util.List;

/**
 * 当类型无法创建时，此异常被抛出。通过{@link #getKeys()}方法返回正在被依次创建的类型。
 */
public class DIException extends RuntimeException {

    private List<Key> keys = new ArrayList<Key>();

    public DIException(String message, Key key) {
        super(message);
        keys.add(key);
    }

    public DIException(String message, Key key, Throwable cause) {
        super(message, cause);
        keys.add(key);
    }

    public void add(Key key) {
        keys.add(key);
    }

    /**
     * 返回正在被创建的类型
     * @return 正在被创建的类型
     */
    public List<Key> getKeys() {
        return keys;
    }

    @Override
    public String getMessage() {
        StringBuilder sb = new StringBuilder(super.getMessage());
        sb.append("\nkeys:");
        for (Key key : keys) {
            sb.append(key);
        }
        return sb.toString();
    }
}
